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Raster vs vector graphics
Computer graphics can be produced as either raster or vector images. Raster images use a grid of pixels that can lose quality when enlarged, while vector images use mathematical objects so quality is maintained at any size. Common file formats like JPEG and GIF are used for raster images, which tend to be larger files, while vector programs like Illustrator create smaller vector files suitable for logos and graphics that need crisp scaling. Resolution refers to the pixel or dot density of an image, with 72 ppi for screens and over 150 dpi recommended for high-quality print.
In this document
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Introduction to computer graphics, its impact on production, and transition from manual to digital processes.
Definition of raster graphics, pixel-based image composition, file size considerations, and quality loss upon scaling.
Definition of vector graphics, advantages like scalability, and usage in logos and typography.
Overview of common image file formats such as BMP, GIF, JPEG, and TIFF with their specific uses.
Explanation of image resolution in pixels per inch for screens and dots per inch for printing, emphasizing quality standards.
Thank you note, concluding the presentation.
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- 1. Introduction toIntroduction to ComputerGraphicsComputer Graphics Raster Vs. VectorRaster Vs. Vector COMMUNICATION TECHNOLOGY
- 2. Computers have radicallychanged how graphics, photos and printed materials are produced. What once took a highly trained artist many hours to produce with specialized equipment can now be done much easier using computer software. Intro to Computer GraphicsIntro to Computer Graphics
- 3. Graphics areproduced using a grid of small squares known as pixels. Each pixel is assigned a specific colour value and location. When editing a raster graphics (ex. Digital photo), you are actually editing pixels rather than objects or shapes (Photoshop) Pixels can be seen by zooming in on a digital image (tiny squares). Raster GraphicsRaster Graphics (write blue text)(write blue text)
- 4. Raster graphicsare generally larger files than vector images. Images lose quality (become “pixelated”) if enlarged more than 20% of the original size. Raster GraphicsRaster Graphics (write blue text)(write blue text)
- 5. Drawing programssuch as CorelDraw and Adobe Illustrator produce vector graphics. These types of graphics are made of lines and curves defined by mathematical objects called vectors (geometric characteristics). Vector GraphicsVector Graphics (write blue text)(write blue text)
- 6. A vectorgraphic can be moved or resized without losing quality and file sizes are generally smaller than raster graphics. Best choice for creating type or logos where crisp outlines are needed since clarity is not lost when scaled/resized. Vector GraphicsVector Graphics (write blue text)(write blue text)
- 7. BMP: Bitmapis the standard Windows image format GIF: Graphics Interchange Format; designed to minimize file size and download (electronic transfer) time Common Image FilesCommon Image Files (write blue text)(write blue text)
- 8. JPEG: JointPhotographic Experts Group; compresses file size by selectively discarding data, unlike GIF format, JPEG retains colour information. TIFF: Tagged-Image File Format; used to exchange files between applications and computer platforms; “flexible” bitmap image supported by virtually all paint , image editing, and page-layout applications. Common Image FilesCommon Image Files (write blue text)(write blue text)
- 9. Resolution ishow many pixels or dots make up the image you see. On a monitor, resolution is measured in pixels per inch. Screen resolution is 72 ppi. ResolutionResolution (write blue text)(write blue text)
- 10. Print resolutionis measured in dots per inch. Print resolution should be at least 150 dpi. For high quality printing, images should be 300 dpi or greater. Print resolution depends on the printing press being used (Offset, Web etc.). ResolutionResolution (write blue text)(write blue text)
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